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Actually if the Focus is like my 2011 Fiesta, then it's not really neutral. Coasting in neutral, you can feel the transmission downshifting as you slow down below 45 MPH. The clutch just stays disengaged until you move the shifter back to drive.
You can also calculate the idle fuel consumption by coasting down below 25 MPH and resetting the fuel mileage computation until it drops below 99 MPG. Divide the speed by 99 to get your idle consumption.
Example. If the mileage drops below 99 (max reading) at 20 MPH, then your idle consumption is 20/99, round it off to .2 GPH.
regards
mech
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